Chapter 5, Problem 5F.1AST

Interpretation Introduction

Interpretation:

The temperature at which a solution of analgesic codeine, ${\text{C}}_{\text{18}}{\text{H}}_{\text{21}}{\text{NO}}_{\text{3}}$ in benzene at a molality of $\text{0}\text{.20}\text{mol}\text{.}{\text{kg}}^{\text{-1}}$ will freeze has to be calculated.

Concept Introduction:

The freezing point depression for an ideal solution is proportional to the molality of the solute.  For a nonelectrolyte solution, the freezing point depression can be given as

  $\begin{array}{l}{\text{ΔT}}_{\text{f}}\text{=}{\text{k}}_{\text{f}}\text{×}\text{b}\\ \text{where,}\\ {\text{ΔT}}_{\text{f}}\text{=}\text{Depression}\text{in}\text{freezing}\text{point}\\ {\text{k}}_{\text{f}}\text{=}\text{freezing}\text{point}\text{of}\text{solvent}\\ \text{b}\text{=}\text{molality}\end{array}$